Add support for the -external-runtime argument and update all language modules to use it

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@6993 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Source/Modules/chicken.cxx

@@ -93,6 +93,9 @@ protected:
 
   String *chickenNameMapping(String *, String_or_char *);
   String *chickenPrimitiveName(String *);
+
+  String *runtimeCode();
+  String *defaultExternalRuntimeFilename();
 };
 
 /* -----------------------------------------------------------------------
@@ -1329,3 +1332,15 @@ CHICKEN::validIdentifier(String *s)
     }
     return n;
   }
+
+  String *CHICKEN::runtimeCode() {
+    String *s = Swig_include_sys("chickenrun.swg");
+    if (!s) {
+      Printf(stderr, "*** Unable to open 'chickenrun.swg'\n");
+      s = NewString("");
+    }
+  }
+
+  String *CHICKEN::defaultExternalRuntimeFilename() {
+    return NewString("swigchickenrun.h");
+  }